Fluid-tight watch



Patented Oct. 5, 1937 FLUID-TIGHT WATCH Ernest Hooter, La Chaux de Fonds, Switzerland Application December 1, 1936, Serial No. 113,715

In Switzerland December 11, 1935 2 Claims.

This invention relates to fluid-tight watches and has as its principal object the provision of a stern winding device in which the crown of the winding stem forms a tight joint with the watch case to prevent entrance of water, moisture or other matter which would damage the watch movement.

Another object is the provision of a cheap, simple and efiective joint between the winding crown and the watch case, without requiring any special spring means than those present in any ordinary stem winding device, to hold the coacting parts of the joint in tight engagement.

The invention will be described with reference to the accompanying drawing showing a sectional view of a stem winding device according to the present invention.

The center band I of a watch case includes a pendant 2 in the shape of a short tube having a conical opening 3 the shorter diameter of which being at the inner end of the tube. The winding stem is disposed as usual in an opening 4 of the movement plate 5 and is composed of two sections 6 and l. The outer section B is hingedly connected to the inner section 1 by means of a hinge pin 8 carried by the inner section and extending through an opening 9 of the outer section, which opening is of slightly larger diameter than that of the hinge pin 8. The outer stem section 6 extends into the tube 2 and is screwed into a conical central plug portion ID of the winding crown II. The conical plug I0 is adapted to coact with the conical wall of the tube 2 and to form a tight joint when applied against this wall.

The push lever I2 is pivotally mounted on the pin l3 and has as usual one end It engaging an annular groove IS in the winding stem. The outer end N5 of the lever l2 coacts with the end of the lever I! which produces the downwards movement of the sliding gear IB when the crown II is pulled outwardly for setting the watch, in order to bring the gear I8 into mesh with the setting pinion l9 and to disengage the winding pinion 20. A spring 2| acts on the lever H to move the lever upwardly and the sliding gear back into the represented position when the crown is pushed inwardly after a setting operation. A spring 22 coacts with a pin 23 of the lever l2 to hold the lever in either one of its two different positions according to the winding stem being in winding position or in setting position. Operation of these parts of the winding device is well known and does not require to be described here in detail.

The drawing shows the winding device in winding position. In this position the end ll of the lever l2 bears on the shoulder 24 of the stem, and owing to the action of the springs 2| and 22 which tend to turn the lever l2 in counterclockwise direction, the stem is urged downwardly with the effect of pulling the conical plug I0 of the winding crown into the conical opening 3 of the tube 2. A tight joint between the crown and the tube is thus obtained without requiring the provision of a screw thread connection or of an additional spring, as it is the case in known constructions, to apply the cooperating portions of the joint one against the other.

Owing to the tube 2.

I claim:

1. A stem winding device for a watch having a watch case provided with a conical opening giving passage to the winding stem, said winding stem being formed of inner and outer sections movable relatively to each other, a winding crown carried by the outer section of the winding stem, said winding crown being provided with a conical plug portion adapted to coact with the conical opening in the watch case, and means for resiliently holding the winding stem in winding position, said means acting on the winding stem, when the stem is in winding position, to pull the conical plug portion of the winding crown into the conical opening of the watch case.

2. A stem winding device for a watch having a watch case carrying a pendant provided with a conical opening giving passage to the winding stem, said stem being formed of inner and outer stern sections hingedly connected one to the other so that the outer section may be axially displaced relative to the inner section, a winding crown carried by the outer stem section, said crown of the pendant.

ERNEST HOETER. 

